Bit forge



June 11, 1929. F. J. HINDERLITER .7 6.

BIT FORGE Original Filed Feb. 23. 1927 EV? ESE Patented June 11', 1929.

UNITED T T PATENTOFFICE;

RAN JQI-IINDERLITER, OF TU-LSA, OKLAHOMA.

BIT FORGE.

Application fileliFebruary 23, 1927, Serial N0 .7170,187. Renewed August23, 1928.

In the forging of bits for use in connec tion with drilling oil wellsand the likeeonsiderable trouble has been experienced due to the factthat a great many bits are broken or rendered unlit for use, due to thefact that the flame enters aforge in such a way that it is permitted tocircle over the cutting edge of a bit and heats the blade back of saidcutting edge directly in the water course. Moreover; the 'web of thesaid bit being thin is adapted to absorb the heat quicker than the heavysections thereby caus-- ing' the web to expand prior to the expan-- sionof the heavy sections, thereby usually causing the bit to burst or crackin lengths usually from three to six'inches in a diagonal direction. Thecrack does not always run out to the cutting edge due to the temper ofsaid edge so that the defect is not observed until after the bit hasbeen in use and breaks. As a result of the above procedure the bilsarenot'evenly heated and are furthermore not properly treated or temperedafter being heated which accounts for a large proportion of the bitsbreaking when put into use.

This invention relates to an improved bit forge so constructed that abit is adapted to be evenly heated by swirling blast flames entering thefire chamber without coming into direct contact with the bit or steelbeing heated, thereby permitting the steel to be tempered at a. risingheat after which the bit is permitted to lay on an anvil after dressinguntil a hand can be laid on the same; the bit may now be placed back inthe forge and given a short heat on the end of the bit until the bit isbrought upto a dark cherry red color after which thebit is removed andthen put in a clean slack tub.

It is an object of this invention to provide afbit forge of simplifiedconstruction permitting a bit to be evenly heated at its drilling endwithout causing bursting of the enlarged end of the bit which ispermitted to be heated prior to the heating of the thin web formedbetween the water courses of the bit.

It is" also an object of this invention to provide a simplified. forgewith arefraetory lining} different sections of which are of differentthicknesses, to provide a main fire chamber, an entrance fora bit, and arear or inner chamber or recess permitting the enlarged or heavy endsections of the bit to be; heated prior to the heating of the webbetween the water courses thereby producing an even heating of the bitobviating burstingt 1 It is an important object of this invention toprovide an improved simplified forge having an outer casing containingrefrac-- tory lining constructed to afford a fire chamber and anauxiliary rear fire pocket permitting flames which enter the firechamber tangentially to whirl around in the fire chamber and pocket topermitthe enlarged end or heavy section of a bit to be heated prior tothe heating of the web to obviate bursting of the bit and theeliminationof any cracks therein. a

Other and further important objects of this invention will-be apparentfrom the disclosures in the specification and the Jaceon'ipanyingdrawings.

This invention (in a preferred form) is illustrated in the drawings andhereinafter more fully described.

On the drawings: Figure l is a side elevation of an improved forgeembodying the principles of this invention and showing a fragmentaryportion of a bit projecting into the forge.

Figure 2 is an enlarged transverse section of the upper portion oftheforge taken on line II-IIof Figure-1 with parts shown in elevation.

Figure 3 is a horizontal section taken on line IIIIII of Figure 2 with afragmentary portion of a bitshown in elevation.

As shown on the drawings:

iThe reference numeral'l indicates a supporting framework or standsupported by rollers or casters 2 to permit the forge to be readilymoved about. Supported. on the fame 1 is an outer sheet metal casing 3of cylindrical form open at the front end and provided with a rear wall4 having a central opening at 5. The opening 5 is closed by means of ametal ring plate 6 and a closure plate or disk 7 which is secured tothering plate 6to close the opening therein. The casing 3 is providedwith a lining constructed of standard fire bricks made of fused siliconcarbide, carborundum or any other suitable refractory material.Therefractorybricks are arranged in a predetermined order to provide-anouter lining or shell 8 consisting of three adjacently disposed rings orlayers of bricks which-form an outer lining which extends from thefrontto the rear of the outer casing 3.

face of the rear casing wall 4 and project forwardly to overlap theintermediate annular row or layer of fire bricks forming part of' theouter fire brick lining 8. The

inner periphery of the annular row of fire,

bricks 1O registers with the periphery of the o )enin 5 within the rearcasin wall t thereby affording a rear pocket or recess 11 closed at oneend by the overlapping metal plates 6 and 7 and having the other endthereof communicating with the middle portlon of a fire or main'chamber12 formed by the middle annular row of fire bricks of the outer lining 8and the rear lining-wall 910, togetherrwith a front lining wall 13constructed; of standard refractory fire bricks of but a single row orlayer positioned'within. the front portion of the outer lining 8 andextending rearwardly a dis-. tance sufficient to overlapa portion of theintermediate annular row of .fire bricks forming part ofthe outer lining8. The front lining wall 13 being ofannular construction affords anentrance opening 14-, the inner end ofwliich communicates with the mainfire chamber 12.. The entrance opening 1 1 has a greater diameter thanthe diameter of the rear pocket 11 and is axially aligned therewith. Thecomplete lining of the forge consisting of the annular rows or layersof, fire brick 8, 9, 10, and 13 thus affords three communicatingchambers with the main fire ch -nber 12 having the greatest diameter andbeing positioned between the pocket 11 and the entrance opening 1 1.

Fuel is suppliedto the forge by means of a main F'uel supply pipe 15adapted; to be connected with any suitable source of oil or gas fuel.The end of the'main fuel pipe 15 terminates in a' branchffuel supplypipe" 16 which projects through a suitable opening in the outer casingand the middle row of fire bricks forming the middle part of the outerlining 8. The lower auxiliary fuel supply pipe 16, has the mouth thereofterminating in the main fi're chamber 12 in such a position that a blastof fuel, flames is adapted to be directed tangentially into the lowerportion of themain fuel chamber 12. The flames entering from the lowerauxiliary fuel supply pipe 16 impinges against the circular wall of thechamber 12 which causes the flames to'whirl around the outer peripheralportion of the chamber 12 to commingle with a similar flame tangentiallyentering the ,upper portion of the chamber- 12tl1r0ugh the mouth of asec- 0nd" or upper auxiliary fuel supply pipe 17 which projects into theupper portion of the forge and has the outer end 18 thereof curved orbent a'round, the exterior of the forge casing 3, with the lower end ofsaid exterior pipe 18 connected with the main fuelsupply 15 at a pointadjacent the lower auxiliary fuel supply pipe 16, as clearly illustratedin Figure 2. Mounted on the exterior of the frontside of the forgesupporting frameworlil is bracket 19 supporting a tableor shelf 20having a rounded head or guide flange 21 formed thereon to afford aguideand support for the drilling end of a bitor other tool which is to betempered. As shown in the drawings the reference numeral 22 indicates asteel'bit having a pair of oppositely disposed longitudinally directedgrooves or water courses 23 formed therein, with said water coursesterminating in the drilling end or nose 2% of thebit. The nose end ofthe bit is flared outwardly to a diameter greater than the diameter ofthe bit proper with the water courses forming a web'25. The bit isprojected into the forge through the entrance opening 1 1 a distancesufficient to position the enlarged noseor drilling end of the bit insubstantially the mi ddle of the main fire chamber 12 anddirectlyopposite the fire pocket 11 as illustrated in Figure 3. Ifdesired, an upper guide similar to the; guide member 21 may be providedsecured to'the upper front portion of the forge above the lower guidemember21. y

It will be noted from the description that when the drilling end of abit is positioned in the forge supported on the shelf 20" and the guidemember 21 thereof that flames entering from the lower and upper fuelsupply pipes 16 and 17, respectively, will follow the contour of thecurved wall or the main fire chamber 12.and will consequently whirlaround the nose port'ion of the bit without hittingdirectly on thesteel. The nose portionof thebit is larger than the main portion of thebit and substantially thicker than the web 25. The fire pocket 11assists the main chamber 12 to cause the nose to be heated prior to theheating up of the thin web portion 25, thereby causing an even heatingof the different portions at the nose end of, the tool obviating cracksand bursting of the metal at the drilling end of the tool. Bursting atthe nose end vof the tool occurs when a bit is heated in a manner tocause the thin web portion of the tool to be heated before the heavysections of the tool are heated resulting in the expansionof the thinportion of the tool prior to the expansion of the large sections of thetool, thereby causing the tool to crack and burst. These difiicultiesare overcome in the present invention, as hereinbeforc stated. To getthe best results a steel bit should be tempered at a rising heat and notata falling heat.

A bit to be tempered should lay on the. anvil after dressing until ahand can be laid on the same. The bit should then be put back into theforge and the nose end should be given a short heating for a distanceof'about two inches onthe tip of the bit until said nose portion reachesa dark cherry red color. The bit should now be removed and projectedinto a clean-slack tub to cool the same without causin an made, andnumerous details of construction may be *aried through a wide range without departing from the principles of this invention, and I therefore donot purpose limiting the patent granted hereon, otherwise thannecessitated the prior art.

I claim as my invention:

1. A bit forge comprising a framework, a metal casing mounted thereon,and a refractory lining in said casing eonsistingof rings of differentradial depths forming the -interior of the forge into a mainint(n'mediate fire chamber,a rear fire pocket communicating with themain chamber, and a front opening also communicating with the mainchamber and permitting a tool to be tempered to be projected into thehousing, with the nose of the tool positioned in substantially themiddle portion of the main chamber. i i

2. A bitforgecomprising a framework, roller supports therefor to permitn'iovement of the framework, a metal casing thereon open at one end andclosed at the other end, means on the framework for supporting a tool inposition with one end of the tool projecting into the forge, and arefractory lining in said casing consisting of three concentric layersof fire brick forming-anv inner lining section having a fire pocket"therein,

an intermediate lining section consisting of a single layer of firebricks and forming a main fire chamber connnunicating with said firepocket, and an outer lining section consisting of twoiconcentrie layersof fire brick and forming an entrance opening through which the toolisprojected into the forge permitting the nose of said tool to bepositioned substantially in the middle portion of said main firechamber.

3. A bit forge comprisinga framework, roller supports therefor, a metalcasing sup ported on the framework with said'casing open at one end andclosedat the other, a refractory lining in said casing with said liningcomprising sections of different radial depths to form a large firechamber within the central portion of the forge communicating with arear fire pocket and a front entrance opening with the diameter of theentrance opening being greater than the diameter of the rear fire pocketand less than the diameter of said main fire chamber, a guide bracketmounted on the framework adapted to support a bit with the nose end ofsaid bit projecting through said entrance opening into the main firechamber, and means for directing a plurality of flames tim 'entiall intothe main fire chamher to whirl around the nose of the tool withoutdirectly hitting the same. a

4. A. bit forge comprising a framework, a metal casing mounted thereon,a refractory lining for said. metal casing with dif- :ferent sections ofthe lining being of differ iate fire chamber, a front opening of lessdiameter than the diameter of the main fire chan'iber', and. a rear firepocket communicating with the main fire chamber and of a diameter lessthan the diameter of the front opening, and fuel supply pipes projectinginto the lower and upper portions of the casing and through the middlesection of the lining to direct flames tangentially into the main, firechamber.

5. A bit forge comprising a metal casing open at one end and closed atthe other end, a support therefor, a tool guide and support mounted onsaid portable support to hold atoolin position with one end thereofprojecting into the forge, a lining in said casing comprising anintermediate section, a front section ofa depth greater than the in:termediate section, and a rear section of a depth greater than the frontsection, said sections forming the interior of the forge into a largeintermediate fire chamber, a rear fire pocket comnmnicating therewith,and a front opening connnunicating with. said fire chamber and open atthe open end of said casing, and fuel supply pipes projecting throughthe casing and through the intermediate lining section into the mainfire chamber to direct flames around the end of the tool to be tempered.

6. A bit'forge comprising a metal casing open at one end and closed atthe other end,

a refractory lining in said casing comprisng an intermediate section ofa selected depth, a front section of a depth greater than the depth ofthe intermediate section, and a rear section of a depth greater than thefront section, said lining sections forming the interior of the forgeinto a large main fire chamber in'the intermediate section, a rear firepocket in the rear section, and an entrance opening in the frontsection.

7. A bit forge comprising a casing open at one end and closed at theother end, a refractory lining in said casing comprising anintern'iediate section, a front section of greater depth, and arearsection of a depth greater than the depthof the front section,

cut radial depths to form a large intermed,

thereby forming the interior of the forge into a main fire chamber, arear fire pocket communicating therewith, and a front openingcommunicating with the main fire chamber and open at the open end of thecasing to permit a tool to be tempered to be projected into the mainfire chamber adjacent said. rear fire pocket, and means for directingflames into the main fire chamber.

8. The combination with a bit forge, of a lining therefor comprising arear section constructed of a plurality of annular concentric rows ofrefractory fire bricks, a front section constructed of a plurality ofannular concentric rows of fire bricks of a depth less than said rearsection, and an intermediate section positioned between the rear sectionand said front section and of a depth less than the depth ofeither ofsaid sections, said sections dividing the interior of the forge into afire chamber positioned between and communicating with a rear firepocket and a front entrance opening.

9. A bit forge comprising a metal casing open at the front end andhaving the other end closed by a rear wall having a central openingtherein, overlapping plates secured to said rear wall to close theopening thereof, a support for said casing, a lining in said casingconstructed of a plurality of annular rows of hire brick arranged todivide the interior of the forge into a rear fire pocket, a fire chambercommunicating therewith, and an entrance opening communicating with saidfire chamber, and means for directing flames tangentially into the firechamber.

10. in combination in a forge, a casing having an annular chamber,parallel flame inlets positioned to, discharge tangentially into saidchamber, said inlets being diametrically opposite each otherandai'rangcd to augment and continue the flame discharged from eachother in order to maintain a substantially continuous and whirling ringof flame within said chamber, and means in said casing for defining anopening to receive the end of a tool .to be treated, said opening beingdisposed in communication with the center of said chamber so that saidend of the tool can be positioned within the center of said ring offlame in said chamber.

11. In combination in a forge, a casing having an annular chamberdisposed in a vertical plane, upper and lower tangential parallel flameinlets disposed in communication with said chamber, said inlets beingarranged to augment and continue the flame discharged from each other inorder to maintain a substantially continuous and whirling ring of flamewithin said chamber, said casing having an, opening disposed in communication with the center of the ring of flame for receiving the end of ametal piece to be treated whereby the ring .of flame encircles said endof the piece and heats the portions of the same uniformly, and means insaid casing for defining a fire pocket disposed in alignment with saidopening and arranged to assist the flame chamber in causing the extremeend or nose of said metal piece being treated to be heated prior toother portions thereof and to thus insure an even heating of thedifferent portions of said end of the metal piece.

12. in combination in a forge, a casing having an annular flame chamberdisposed in a vertical plane, a pair of parallel flame inletsdischarging tangentially and in opposite directions into said chamber,said inlets being diametrically opposite each other and arranged toaugment and continue the flame discharged from each other after theflame from each has traveled approximately 180 in said chamber in orderto maintain a substantially continuous ring of flame within the chamber,and means in said casingfor defining a fire pocket disposedin alignmentwith said opening and arranged to assist the flame chamber in causingthe extreme end or nose of a metal piece being treated to be heatedprior to other portions thereof and v to thus insure an even heating ofthe ditferent portions of said end of the metal piece.

13. In combination in a forge, a casing having a substantially annularchamber therein, spaccd flame inlets positioned to dischargetangentially into said chamber, said inlets being arranged to augmentand continue the flame discharged from each other in order to maintaina-substantially continuous and whirling ring of flame within saidchamber, means in said casing for defining an opening to receive the endof the tool to be treated, said opening being disposed in communicationwith the center of said chain her so that said end of the tool can bepositioned within the center of said ring of flame in said chamber, andmeans in said casing for defining a fire pocket disposed in alignmentwith said opening and arranged to assist the flame chamber in causingthe extreme end or nose of a metal piece being treated to be heatedprior to other portions thereof and to thus insure an even heating ofthe different portions of the said end of the metal piece.

In testimony whereof I have hereunto subscribed my name at Tulsa, TulsaCounty, Oklahoma.

' FRANK J. HINDERLITER.

